Electron Paramagnetic Resonance of Gd³⁺ in Yttrium-Group VA Intermetallic Compounds

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Electron paramagnetic resonance of Gd³⁺ diluted in intermetallic compounds YX (where X is one of the group-VA elements, P, As and Sb) has been studied from 4.2 K to 300 K. The data can be interpreted by employing Hasegawa’s theory. It has been shown that the systems approach the isothermal limit when the Gd³⁺concentration in YAs and YSb is less than 1 atomic per cent. The temperature-dependent linewidth increases drastically with increasing lattice constants of the hosts.